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cfe1cb014b
pressure: SGX uses normal RAM allocated from special shmem files as backing storage when it runs out of SGX memory (EPC). The code was overly aggressive when freeing shmem pages and was inadvertently freeing perfectly good data. This resulted in failures in the SGX instructions used to swap data back into SGX memory. This turned out to be really hard to trigger in mainline. It was originally encountered testing the out-of-tree "SGX2" patches, but later reproduced on mainline. Fix the data loss by being more careful about truncating pages out of the backing storage and more judiciously setting pages dirty. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEV76QKkVc4xCGURexaDWVMHDJkrAFAmKLqcgACgkQaDWVMHDJ krA7rA//ZgNgOTzCp/jdntz2KSp9MPhwaSJg0MUnsa7wt0T/3sPXaEAu9wgSZod7 xqxH17LKUc27SyALtPrkvm68aVZ/Z0Nhq2gDndspXd/Zcl/CD/Cy+GI+ZpdNoYhz Fuqiq1TrszzzqBksgiEal9S874+jum2uWqYBMHB45ODp+E7F479Zm42hI3dSp1VN 6n5zOi5u+unHgDRQ/rwMovu2XU61ZXrycqkbZvu4P4tRbEUH+EhAMKG2RyZOB2V9 XNqr1vBJ122CWMIxcdzEUEofPFFwVEtC9jK+rdgUW1ZYAPJDjVvcnXx7dpA9PHLb DytBSWyeISllJKbea1pIMsdCT/IE4I3s0US2ZA3Ru7YAMgUIi+IGu++JJ2dWdDvx GoJz6yBVw4r6cl7kLUfbtIUPsJLYkEMpTM4XODsxMwzd2/Jdbe2UfQskzEn9Auvc 1qGRspu/3VbqE5WFz5Npd94+B+8BOo7kKLcizBHqmX8U2PBkMnhRatxDMCu8frfL DlrjosgUgMYQRkEp3Zugo33O8F2EAE0T1I9g7N4sullX0jGnFifjgiPipnWcnIB9 RnF5NHdrTMPwqhvzz+3o1yJgve56juZxESqn1khEIQEqgUtxFaEnrmYzdLlVkoGg XbuY7TNp1hDC3s9OHeiCL2oUaSmyh0eKCokLiAuWowVzbuU69BU= =pTAC -----END PGP SIGNATURE----- Merge tag 'x86_sgx_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 SGX updates from Dave Hansen: "A set of patches to prevent crashes in SGX enclaves under heavy memory pressure: SGX uses normal RAM allocated from special shmem files as backing storage when it runs out of SGX memory (EPC). The code was overly aggressive when freeing shmem pages and was inadvertently freeing perfectly good data. This resulted in failures in the SGX instructions used to swap data back into SGX memory. This turned out to be really hard to trigger in mainline. It was originally encountered testing the out-of-tree "SGX2" patches, but later reproduced on mainline. Fix the data loss by being more careful about truncating pages out of the backing storage and more judiciously setting pages dirty" * tag 'x86_sgx_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/sgx: Ensure no data in PCMD page after truncate x86/sgx: Fix race between reclaimer and page fault handler x86/sgx: Obtain backing storage page with enclave mutex held x86/sgx: Mark PCMD page as dirty when modifying contents x86/sgx: Disconnect backing page references from dirty status |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.